#常量和表达式
# print(5 + 1)
# print(6 + 5 * 1)
# print(2 / 3 + 8)

# sum = 89.9 + 96 + 76
# average = sum / 3
# print(sum)
# print(average)

# a = 6    #字母
# a1 = 8   #字母+数字
# s_1 = 10 #字母+下划线+数字

# #定义变量a,并初始化
# a = 6
# print(a)
# #修改变量a
# a = 8
# print(a)

# a = 10
# b = 0
# a = b
# print(a)
# print(b)

# a = 10
# print(type(a))
# b = 12.6
# print(type(b))
# c = "bai"
# print(type(c))
# d = True
# print(type(d))

# a = 'hello '
# b = 'bai'
# print(len(a+b))
#
# c = 5
# d = 1
# print(len(c+d))

a = 10
print(type(a))
a = 'hello bai'
print(type(a))
